Windows 10 after Ubuntu on second SSD

I built a new desktop machine and need to install Window alongside Ubuntu. I know the traditional logic is that you should install Windows first, then install Ubuntu, but I got so danged excited I went and installed Ubuntu first, as I only need Windows for gaming.

Now I am looking to slap Window onto the second SSD in the box and I'm having a hard time finding any advice that pertains to my situation - most documentation I can find speaks more towards installing the two OSs alongside each other on a single disk.

It's a UEFI install, Ubuntu on an NVMe M.2 SSD, Windows 10 will be going on a SATA coected SSD. Ideally I can keep Windows 10 dirty paws off the primary Ubuntu NVMe SSD all together, it should live in isolation on the second SSD like the outcast it is.

Discoecting the NVMe SSD during the Window install _should_ do the trick, but is that really necessary? Is Windows really going to start messing with the bootloader of a completely different disk? I mean, how does it know which I am going to boot off of.

Anyways, it's been a *long* time since I've installed Window onto anything, I'm hoping I can be lazy and not have to discoect anything, but I'm skeptical I can give Window that much credit. I know, worst comes to worst, I can reinstall grub 2, but at that point I would probably just do a complete reinstall, my new baby has to remain perfect